diff --git a/sj.h b/sj.h
    index 60bea9e..25f6438 100644
    --- a/sj.h
    +++ b/sj.h
    @@ -85,6 +85,7 @@ top:
             return res;
     
         case '{': case '[':
    +        if (r->depth > 999) { r->error = "can't go deeper"; goto top; }
             res.type = (*r->cur == '{') ? SJ_OBJECT : SJ_ARRAY;
             res.depth = ++r->depth;
             r->cur++;